No ransegan yet, and no shushin or hiraishin. They're too advanced for what Kei reached. Of course, he'll still have what Naruto would consider a good base until he passed away to work with. Namely kage bunshin and kage shuriken, henge, a decent taijutsu background, sexy no jutsu, harem no jutsu, his fox summons, and possibly a few others like the 'Uzumaki Naruto Rendan' and '1000 years of pain'. :rofl: In terms of testing out on pure power, Keitaro would rank somewhere along the lines of a special chunin taught solely within his clan. He'd have the chakra and potential for more, but not the experience. Incidentally Haruka would hold a similar rank in the eyes of Konoha simply for the sake of the fact she never took any formal tests to show her true power.
Keitaro would need to bone up to get back to even chunin level, but I think he could do that fairly easily through the manipulations...I mean AID of several clans if he tried.
Give him six months, some motivation, and a dash of Naruto's I'll learn the ransengan in less than amonth determination and he'd be at lower jounin level without too much trouble.
Hmmm...Keitaro, Kanako, and one of the the Konoha girls chasing him as a temp team to enter the chunin exams to test keitaro's skills. I'll have to think about that one. :unsure: